Untitled

using System;

class Program
{
    static void Main()
    {
        double[,] numbers = new double[3, 3];
        double sum = 0;

        Console.WriteLine("Vuvedi 9 chisla:");

        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 3; j++)
            {
                numbers[i, j] = double.Parse(Console.ReadLine());
                sum += numbers[i, j];
            }
        }

        Console.WriteLine("Kvadratni koreni > 10:");
        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 3; j++)
            {
                if (numbers[i, j] >= 0)
                {
                    double sqrt = Math.Sqrt(numbers[i, j]);
                    if (sqrt > 10)
                    {
                        Console.WriteLine(sqrt);
                    }
                }
            }
        }

        double diagonalSum = 0;
        for (int i = 0; i < 3; i++)
        {
            diagonalSum += numbers[i, i];
        }

        double diagonalProduct = 1;
        for (int i = 0; i < 3; i++)
        {
            diagonalProduct *= numbers[i, 2 - i];
        }

        Console.WriteLine("Sumata na vsichki elementi e: " + sum);
        Console.WriteLine("Sum na glavniya diagonal = " + diagonalSum);
        Console.WriteLine("Proizvedenie na vtorichniya diagonal = " + diagonalProduct);
    }
}